Exploiting an Alternative CO₂ Absorption Process by Efficient Solvent Mixture

Abstract

CO 2 capture greatly helps with greenhouse gas mitigation. Chemical and physical absorption can control CO 2 emission, but these methods are costly. To reduce the cost, an efficient solvent mixture of tetramethylammonium hydroxide (TAMH), tetramethylene sulfone (TMS), and ethylene glycol (EG) is assessed. Gas−liquid equilibrium, reaction kinetics, and mass transfer models are developed and validated by experiments. Henry's constant, reaction kinetics, and mass transfer coefficients between CO 2 and TAMH-TMS-EG are identified. CO 2 loading and mass transfer coefficient are, respectively, obtained as 0.55 mol/molTAMH and 4.02kmol/m 2 /s/kPa, which are on average 25% and 34% higher than the typical MEA process. The theoretical energy consumption amount for desorption of TAMH-TMS-EG-CO 2 solutions is identified as 1.11 GJ/t to 1.34GJ/t. Minimum mass transfer resistance is determined at 40% to 80% TMS fraction. A temperature bulge shift and improvement in the interface characteristics enhance mass transfer due to uniform temperature field and good gas and liquid countercurrent contact.

Determining the Interactive Effects in CO2 Capture Integrated with Coal Flotation by High-Order Multifield Synergy Model

“…The CO 2 amount is also increased as the temperature increases. As shown in Figure a, the average CO 2 amount increased three times as the temperature increased from 353 to 373 K. This is attributed to the fact that the thermal desorption becomes stronger as the temperature increases, which is the same as that in the conventional thermal CO 2 desorption in amine solution. , …”

“…As shown in Figure 6a, the average CO 2 amount increased three times as the temperature increased from 353 to 373 K. This is attributed to the fact that the thermal desorption becomes stronger as the temperature increases, which is the same as that in the conventional thermal CO 2 desorption in amine solution. 2,5 The interactive effects between coal, amine, and CO 2 also intensify the coal recovery rate by coal flotation. The coal recovery rate is provided in Figure 6b.…”

“…The high cost is mainly caused by the energy consumption for desorption, amine loss due to evaporation, and so on. 4,5 Thus, substantial attentions have been recently paid to reduce the amount of energy consumption in amine absorption of CO 2 , including process intensification, reactor retrofit, parameter optimization, etc. As an effective technical route to intensify the CO 2 desorption, addition of intensification substances, like nano Fe 2 O 3 , has achieved great potential to reduce the energy consumption by improving the heat transfer to increase the heat transfer efficiency.…”

“…To significantly reduce the CO 2 emission from a power plant, amine absorption of CO 2 has been proven to be an industrially promising route due to the high CO 2 removal efficiency. , However, the high cost for amine absorption of CO 2 is the predominant issue, which has to be considered seriously. The high cost is mainly caused by the energy consumption for desorption, amine loss due to evaporation, and so on. , Thus, substantial attentions have been recently paid to reduce the amount of energy consumption in amine absorption of CO 2 , including process intensification, reactor retrofit, parameter optimization, etc. As an effective technical route to intensify the CO 2 desorption, addition of intensification substances, like nano Fe 2 O 3 , has achieved great potential to reduce the energy consumption by improving the heat transfer to increase the heat transfer efficiency.…”

Porous carbons from hydrothermal carbonization of corn stover for highly efficient CO2 capture

“…Great efforts have been made to exploit CO 2 capture and storage processes that rely on absorption [1], adsorption [2] or membrane separation [3]. The absorption of CO 2 with alkano-amine solvents is presently the most widely used method for CO 2 capture [4] , however, it has problematic issues related to equipment corrosion, energy consumption and solvent toxicity.…”